ruby: safe level bypass via name_err_mesg_to_str()

Ruby 1.8.7 before patchlevel 371, 1.9.3 before patchlevel 286, and 2.0 before revision r37068 allows context-dependent attackers to bypass safe-level restrictions and modify untainted strings via the nameerrmesgtostr API function, which marks the string as tainted, a different vulnerability than...